WebUI slow

Since a while, the WebUI is loading very slowly. The progress bar and the rotating circle in the global search field at the top takes “endless” (1-3 minutes) to finish.

LibreNMS is running as KVM on a big server with 2 CPUs having 10 cores each. I assigned 14 vCPUs and 16 GB RAM. With iDRAC I can see that the overall host load is usually 7% and max at 37%, I/O usage no more than 1% (all disks are SSD with RAID10 - iostat in the VM is telling %idle 82.92, %iowait 0.44). But the WebUI is on slow motion. I am using nginx. All on one machine, polling 212 devices. rrdcached is running.

Component Version
LibreNMS 21.12.0
DB Schema 2021_11_29_165436_improve_ports_search_index (229)
PHP 7.4.3
Python 3.8.10
MySQL 10.3.32-MariaDB-0ubuntu0.20.04.1
RRDTool 1.7.2
SNMP 5.8

[OK] Composer Version: 2.1.14
[OK] Dependencies up-to-date.
[OK] Database connection successful
[OK] Database schema correct

Beside that, the “mini” graphs of ports section do only show a grey rectangle. That worked in the past. But I used that not very often. So, I can’t say, when that changed. Mouse-over shows the related graphs.

I run “mysqltuner.pl” and set some of the recommended values. It seems that made things worse.

With Firefox inspector, page loads are finishing quickly (1-2 sec), but the progress bar is still and slowly progressing.
Has anyone an idea where to search and how to fix that?

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